ask your doctor about prescription toviaz. one toviaz pill a day significantly reduces sudden urges and accidents, for 24 hours. if you have certain stomach problems or glaoma, or can not empty your bladd, you should not take toviaz. get emergency medical help right away if your face, lips, throat or tongue swells. toviaz can cause blurred vision, dizziness, drowsiness and decreased sweating. do not drive,perate machinery or do unsafe tasks until you ow how toviaz affects you. the most common side effects are dry mouth and constipation. talk to your doctor about toviaz.